X0508 4 2025-05-28 0001823587 Sky Harbour Group Corp SKYH 0001494582 BOSTON OMAHA Corp 1601 DODGE STREET, SUITE 3300 OMAHA NE 68102 1 0 Class A common stock, par value $0.001 per share 2025-05-28 4 S 0 12136 10.6921 D 9068793 D Class A common stock, par value $0.001 per share 2025-05-29 4 S 0 18291 10.7869 D 9050502 D Class A common stock, par value $0.001 per share 2025-05-30 4 S 0 52839 10.30240 D 8997663 D Class A common stock, par value $0.001 per share 2673831 I See Footnote 4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions on May 28, 2025 at prices ranging from $10.65 to $10.77, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions on May 29, 2025 at prices ranging from $10.50 to $10.95, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions on May 30, 2025 at prices ranging from $10.22 to $10.37, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4. All of the shares of Class A common stock sold as reported on this Form 4 were sold by Boston Omaha Corporation. As of the date of this report, Boston Omaha Corporation now owns 8,997,663 shares of the Class A common stock of Sky Harbour Group Corporation and United Casualty & Surety Insurance Company, a wholly-owned subsidiary of Boston Omaha Corporation, owns the remaining 2,673,831 shares of the Class A common stock. /s/ Joshua P. Weisenburger 2025-05-30